<html>
    <head>
      <title>Hello</title>
    </head>
    <body>
       <h1>World!</h1>
       <htmlarea>
           <span>111</span>
       </htmlarea>
    </body>
    <script>

        let r = document.$('htmlarea');

        r.append(<span>2222</span>);

        r.append("3333");

        r.content("232");

        r.prepend("444");
    </script>
</html>